This configuration allows the user to control the Wiper and the Washer from the Camera's web pages or from the VMS.
Depending on the camera capabilities, Wiper and Washer control can be achieved from the Camera's Relays, or from the Telemetry Serial Out over RS485 (Pelco-D protocol). In the second option, the WASPT must be equipped with the optional Telemetry Receiver (DTWRX).
Additional Notes about the Camera
Depending on the system composition, it is necessary to verify if the camera's Digital Outputs can be operated from the selected control interface (Web Browser, VMS Client), or if the camera is able to forward the expected telemetry commands on the Serial Port, in order to activate/deactivate the wiper and the washer pump.
When a VMS is used:
- in case of Relay Control (diagram 1), the VMS Client must provide suitable controls to open/close the camera's relays;
- in case of Telemetry Control (diagram 2), the VMS Client must provide suitable controls to send either Auxiliary commands or Set Preset commands to the Camera, and the Camera must put it on the Serial Port, to let them reach the DTWRX.
It is strongly advised to verify if such commands are correctly forwarded by the Camera, using a Protocol Analyzer connected to the Camera's Serial Port, activating the proper controls from the VMS Client.
Aux controls are not common on VMS, and sometime the VMS Client provides GoTo Preset controls only, making the Set Preset controls available on the Administration interface only.
The following table reports the telemetry commands supported by the DTWRX, which the camera has to provide:
|Wiper Start||AUX 3 ON||FF 01 00 09 00 03 0D|
|SET PRESET 85||FF 01 00 03 00 55 59|
|Wiper Stop||AUX 3 OFF||FF 01 00 0B 00 03 0F|
|SET PRESET 86||FF 01 00 03 00 56 5A|
|Washer Start||AUX 4 ON||FF 01 00 09 00 04 0E|
|SET PRESET 87||FF 01 00 03 00 57 5B|
|Washer Stop||AUX 4 OFF||FF 01 00 0B 00 04 10|
|SET PRESET 97||FF 01 00 03 00 61 65|
Also, some VMS do not provide the mentioned controls, but they allow the configuration of custom commands on the device; this feature can be used to send the Camera special CGI-BIN commands, usually in the URL format; for example:
Check with the Camera manufacturer whether CGI-BIN commands are available for your Camera.